Determination and analysis of CFRP based ondigital image correlation photometry
1. Taizhou Institute of Science and Technology, Nanjing University of Technology and Engineering, Taizhou, Jiangsu 225300, China; 2. Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang, Jiangsu 212013, China
Abstract：To test the tensile elastic modulus and bending modulus of carbon fiber reinforced plastics(CFRP), the tensile test and three point bending test of CFRP specimens were carried out. The measurement and analysis of electrical measurement and digital image correlation (DIC) optical measurement were also conducted. The results show that the tensile modulus values measured by electrical method and DIC optical method are 19.1 GPa and 19.3 GPa, respectively, and the results are similar. The flexural modulus values measured by electrical method and DIC optical method are 18.5 GPa and 19.2 GPa, respectively, and the results are quite different. A threepoint bending finite element model is established based on the electrical data of axial tensile specimens. The displacement field and strain field of specimens by the electrical measurement method are consistent with the analysis results by the DIC optical measurement method, which verifies the reliability of the calculation results of the DIC optical measurement method. Compared with the electrical measurement method, the DIC optical measurement method has the advantages of non-contact, field test features and so on. It can be used to monitor the displacement field in the surface area of specimen in real time and obtain the strain field in the surface area.
GU B Q, CHEN Y. Development of a new kind of sealing composite material reinforced with aramid and preoxidized fibers[J]. Key Engineering Materials, 2007,353/354/355/356/357/358: 1243-1246.
BAI P X, NI Y J, LEI D. Measurement of true stressstrain relationship of stainless steel based on digital image correlation technique[J]. Science Technology and Engineering, 2020, 20(13): 5240-5246. (in Chinese)
［3］
杜善义. 先进复合材料与航空航天[J]. 复合材料学报,2007,24(1):1-12.
DU S Y. Advanced composite materials and aerospace engineering[J]. Acta Materials Compositae Sinica, 2007, 24(1): 1-12. (in Chinese)
ZHANG R, HE L F, HU B. Elastic modulus measurement of strand wire by digital image correlation[J]. Engineering Mechanics,2011,28(9): 251-256. (in Chinese)
JI J M, CHEN J L, GUO G P, et al. Measurement of elastic constants for aviation composite materials using digital image correlation method[J]. Journal of Materials Engineering,2013(10):80-85. (in Chinese)
SHI L, LI H J, ZHANG L, et al. Application of digital image correlation method in a material tensile test[J]. Laser Journal, 2017,38(7): 81-84. (in Chinese)
SUN W, HE X Y, XU M, et al. Study on the tension test of membrane materials using digital image correlation method[J]. Engineering Mechanics, 2007, 24(2):34-38. (in Chinese)
HAO W F, CHEN X W, DENG L W, et al. Evaluation of mode I stress intensity factor of aramid fiber composite materials utilizing digital image correlation method[J]. Journal of Aeronautical Materials, 2015, 35(2): 90-95. (in Chinese)
HAO W F, GUO G P, CHEN X W, et al. Characterization of interlaminate shear properties for composite materials using digital image correlation[J]. Fiber Reinforced Plastics/Composites, 2016（1）: 29-32. (in Chinese)
［10］
HAO W F, GE D Y, MA Y J, et al. Experimental investigation on deformation and strength of carbon/epoxy laminated curved beams[J]. Polymer Testing,2012,31(4)：520-526.
ZHAO L J, HUANG B Z, YUAN H Q. Test study on transverse matrix crack growth of composite laminates with interlaminar short fibers[J]. Journal of Mechanic Strength, 2010, 32(4): 646-650. (in Chinese)
